Sewing machine



SEWING MACHINE Filed Aug. 20, 1923 2 Sheets-Sheet 1 Inventor: Jose Mfllermw Hie Attorneys.

Patented Dec. 15, 1925.

UNITED STATES PATENT OFFICE.

JOSEPH M. MERROW, F HARTFORD, CGNNECTICUT, ASSIGNOR TO THE MERROW MACHINE COMPANY, OF HARTFORD, CONNECTICUT, A. CORPORATION OF CONNECTL' CUT.

SEWING MACHINE.

Application filed August 20, 1923. Serial No. 658,382.

To all whom it may concern:

Be it known that I, Josnrn M. Mnnnow,

a citizen of the United States, residing at Hartford, in the county'of Hartford and State of Connecticut, have invented certain new and useful Improvements in Sewing Machines, of which the following is a specification.

This invention relates to sewing machines and particularly to feed mechanism.

The object of the invention is the provision in a sewing machine of feed mechanism including a readily adjustable element supported by a definitely movable control member whereby the length of stitch produced may be suddenly or gradually changed without stopping the machine, reducing its speed or otherwise interrupting the work. In an overseaming machine such changes in the feed may be employed in producing an ornamental finish like that applied to stockings and familiarly known as clocking and for other purposes requiring variation in the length of the feed during continuous operation of the machine.

The invention consists in an advantageous arrangement of parts as in the embodiment of my invention illustrated in the accompanying drawings and fully set forth in the following detailed description, while the novelty of the invention is defined in the claims succeeding said description.

In the drawings,-

Figure 1, is an end view of an overseaming machine showing my invention embodied therein. I

Figure 2, is a plan. view including feed mechanism shown in Fig. 1, with certain parts in section and others. omitted or broken away.

Figure 3, is a view of associated parts included in the feed mechanism and the means for controlling it.

Figure 4., is a sectional View on of Fig. 3.

Figure 5, is a plan view in section, on line of Fig. 1.

Figure 6, is a view of parts of the feed mechanism as seen from the right in Fig. l, certain parts being in section substantially on line 66 of Fig. 1, and,

Figure 7 is a sectional view on line 77 of F i 1.

Referring to the drawings the characteristic features of a type of machine parline l-l described.

ticularly well adapted to embody my invention will be sufficiently identified through brief reference to certain of the parts as follows. The stitching instrumentalities comprise the curved eye pointed needle 1, upper looper 2, and lower looper 3. The needle receives its motion through the link which connects the needle carrier 5, with an eccentric projection or stud 6, at the end of shaft 7. By mechanism (not shown) associated with upper shaft 7, and lower shaft 8, the looper 2, is actuated to reciprocate and oscillate so that it passes in a curved path extending above and below the needle plate around one edge thereof, and. looper 3, is reciprocated below the needle plate. The needle moves to cooperate with the lower looper below the needle plate, and with the upper looper above the needle plate, and the loopers, below the needle plate, move to cooperate with each other in a well known manner to form overedge stitching.

The tensions, take up and thread guides illustrated, serve their usual purpose in a manner that will be readily understood by those familiar with the sewing machine art,this is also true of the presserfoot and presserfoot mechanism.

The feed mechanism with which my invention is directly involved will now be The feed dog 10, which is secured to a carrier 11, is actuated in the movements characteristic of a four mo tion feed, by eccentrics l2 and 13, secured to the lower shaft 8, adjacent to one end of the machine frame (see Fig. 6). To permit the effect of the eccentrics to be transmitted through the carrier, the latter is mounted for sliding and pivotal motion in a guideway 15, in bracket 16, where it is supported on a pin 17, extending through a block 18, flattened to engage the elongated slot 19, near the rear end of the carrier. By virtue of this manner of supporting the carrier, it may, through parts to be described, be oscillated by the eccentric 12, and reciprocated by the eccentric 13, to produce the required movement of the feed dog. The effect of eccentric 12, is trans mitted through a rectangular block 20, embraced by a bearing opening 21, in the carrier. The effect of eccentric 13, is transmitted through link 22, rocker 23, link 24 and rocker 25, the latter being connected to carrier 11, as by a pivotal joint 26. The rocker 23, is pivoted on stud 27, which is secured in a support 28, held to the base of the machine frame by screws, as 29. Studs 50 and 31, at opposite ends or rocker 23, respectively engage link 22 and link 24, and a hollow stud 32, connects link 24 with the rocker 25, said stud being held in a split socket at the end of the rocker by a clamping screw 38. For convenience in assembling the parts and in order to reduce to a small degree the relative offset oi pivotal connections in the link mechanism described the pivot 26 and the hollow stud or pivot 82, are oppositely extended (see Fig. from surfaces of the rocker which are substantially coincident with the plane of contact of carrier 11, and link 22.

While it will be obvious that the range of movement imparted by eccentric 13, to link 22, rocker 23, and link 24,-, is uniform, attention is now particularly directed to the means associated with the rocker whereby its movement may be made to impart different degrees oi movement to the feed carrier. The means employed include a movable fulcrum for rocker 25. Such a fulcrum may comprise a pivot 3 forming part 01"" a slide block 85, which is fitted. to a dove tail groove 36, in the rocker (see Figs. 3 and This fulcrum is movaole toward and from a point where its axis substantially coincides with the axis of the pivotal joint between the rocker 25 and feed dog carrier 11. V hen the axes mentioned nearly coincide the feeding movement imparted to the feed carrier is very slight and it follows that when the fulcrum is most remote from that of the pivotal joint between the rocker and carrier the maximum feeding movement will be imparted to the feed carrier. Moving the fulcrum to either extreme or any intermediate position may be effected by a lever 38, the arm 39, of which at outer end supports pivot 34-. Lever 38, is mounted 011 a stationary shaft 40, heid at one end in support 28, as by a set screw el-l, while at the other end it is additionally supported by a plate 42, secured to the machine frame by screws It will be noted that the hub oii lever is suiiiciently elongated to bring the arm iito a position where it may be conveniently operated by hand or connected, as by a chain 45, with parts (not shown) operable by foot or knee pressure.

For limiting movement of the feed changing lever to definitely establish the maximum and minimum length oi stitch appropriate for a particular finish, adjust able stop means are employed comprising the screws 46 and 1-7, engageable by a lug or wing 48, depending from the hub of the lever between walls of an opening 49, in support 28, into which latter the stop screws are threaded with their slotted ends convenientlj, accessible for engagement by a screw driver.

Preferably also means including a spring are employed for moving the lever in a direction opposite to that in which it is intended to be moved by arm 4%, or in the direction to engage lug 4:8 with stop screw it. in which position the described parts transmit to the feed dog the maximum movement of the range permitted by the setting of the stop screws, from which it follows that pressure appliet through lever serves to decrease the length of stitch, the limit oi the range in this respect being e nblished when lug e8 engages stop screw H.

Spring means for effecting the action just described, include the plunger 50, and spring 51, placed in a bore 52, in support 28, with the plunger yieldingly engaging the ug of lever 38. The stem 53, ot' plunger o l, is guided in a hollow screw 5%, thr z ded into the outer end of bore 52, and provided "ith a knurled head 55, whereby it may be adjusted to vary the tension of the spring as may be required.

It will be noted that the support 28 and the machine frame are recessed at 56, to provide clearance for the end oi. rocker 2 where it is pivoted to link 241, the latter however, between its ends, makes contact laterally with surfaces 57 and 58, respectively on support 28 and plate 42, so that the bearing thus provided tends to maintain the link in parallelism with associated parts which are similarly maintained by their re spective lateral contact with each other and opposed surfaces 59 and 60, respectively of bearing 28 and the end 01 the machine frame, by virtue of which an influence is exerted whereby eiiicient action of the parts and their increased resistance to wear is assured.

Having thus described my invention, what I claim is 1. Sewing machine feed mechanism including in combination, a pair of eccentrics, a feed dog carrier supported for oscillatory and reciprocatory movement and embracing one 01" the eccentrics, a rocker having pivotal connection with the feed dog carrier, a fulcrum pivot movably associated with the rocker, a link in engagement with the other eccentric, a link in engagement with the rocker, and a second rocker having pivotal connection with each of the links.

2. Sewing machine feed mechanism including in combination, a pair of eccentrics, a feed dog carrier supported for oscillatory and reciprocatory movement and embracing one of the eccentrics, a rocker having pivotal connection with the feed dog carrier, a fulcrum pivot movably associated with the rocker, and means comprising a pair of links and a second rocker for imparting move ment from the other eccentric to the first mentioned rocker.

3. Sewing machine feed mechanism including in combination, a pair of eccentrics, a feed dog carrier supported for oscillatory and reciprocatory movement and embracing one of the eccentrics, a pair of rockers, a link engaging the other eccentric and piv otally connected to one of the rockers, a pivotal connection between the other rocker and the feed dog carrier, a link IEOl'dHlPZLIting movement from one rocker to the other, a movable fulcrum for one of the rockers, and means whereby said fulcrum may be shifted to vary movement imparted to the feed dog carrier.

4. Sewing machine feed mechanism including in combination, a pair of eccentrics, a feed dog carrier supported for oscillatory and reciprocatory movement and embracing one of the eccentrics, a link engaging the other eccentric and contiguous to the feed dog carrier, a rocker, a pivot near each end of the rocker, one pivot connecting the rocker with the feed dog carrier and the other pivot connecting the rocker with means associated with the link, said pivots extending oppositely from surfaces of the rocker which are substantially coincident with the plane of contact of the carrier and link, and a fulcrum for the rocker movable to different points intermediate the pivotal connections.

5. Sewing machine feed mechanism including in combination, a pair of eccentrics, a feed dog carrier supported for oscillatory and reciprocatory movement and embracing one of the eccentrics, a pair of rockers, a link engaging the other eccentric and pivotally connected to one of the rockers, a pivotal connection between the other rocker and the feed dog carrier, a link for imparting movement from one rocker to the other, a movable fulcrum for one of the rockers, a lever for shifting the fulcrum to vary movement imparted to the feed dog carrier, a spring for moving the lever in one direction and means whereby an operator may move the lever in an opposite direction.

6. Sewing machine feed mechanism including in combination, a pair of eccentrics, a feed dog carrier supported for oscillatory and reciprocatory movement and embracing one of the eccentrics, a pair of rockers, a link engaging the other eccentric and pivotally connected to one of the rockers, a pivotal connection between the other rocker and the feed dog carrier, a link for imparting movement from one rocker to the other, a movable fulcrum for one of the rockers, a lever for shifting the fulcrum to vary movement imparted to the feed dog carrier, a spring for moving the lever in one direction, means whereby an operator may move the lever in an opposite direction, and adjustable stop means for limiting movement of the lever.

7 Sewing machine feed mechanism including in combination, a pair of eccentrics, a feed dog carrier supported for oscillatory and reciprocatory movement and embracing one of the eccentrics, a link engaging the other eccentric, a rocker, a pivot near each end of the rocker, one pivot connecting the rocker with the feed dog carrier and the other pivot connecting the rocker with means associated with the link, and a fulcrum for the rocker movable to different points intermediate the pivotal connections.

In testimony whereof I afiix my signature.

JOSEPH M. MERROW. 

